package com.zhuang.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.zhuang.reggie.common.BaseContext;
import com.zhuang.reggie.common.CustomException;
import com.zhuang.reggie.entity.*;
import com.zhuang.reggie.mapper.OrderMapper;
import com.zhuang.reggie.service.*;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;

/**
 * 订单Service
 */
@Service
@Slf4j
public class OrderServiceImpl extends ServiceImpl<OrderMapper, Orders> implements OrderService {

    @Autowired
    private ShoppingCartService shoppingCartService;

    @Autowired
    private UserService userService;

    @Autowired
    private AddressBookService addressBookService;

    @Autowired
    private OrderDetailService orderDetailService;

    /**
     * 用户下单
     *
     * @param orders 参数：{"remark":"不要筷子","payMethod":1,"addressBookId":"1529647748209467393"}
     *               提交的参数只有地址id有用途，需要我们自己查询当前登录用户的用户信息、购物车信息、以及当前地址id的地址信息
     */
    @Override
    @Transactional
    public void submit(Orders orders) {
        //获得当前用户id
        Long userId = BaseContext.getCurrentId();

        //查询当前用户的购物车数据
        LambdaQueryWrapper<ShoppingCart> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(ShoppingCart::getUserId, userId);
        List<ShoppingCart> shoppingCarts = shoppingCartService.list(wrapper);

        if (shoppingCarts == null || shoppingCarts.size() == 0) {
            throw new CustomException("购物车为空，不能下单");
        }

        //查询当前用户信息
        User user = userService.getById(userId);

        //查询当前地址id的地址信息
        Long addressBookId = orders.getAddressBookId();
        AddressBook addressBook = addressBookService.getById(addressBookId);
        if (addressBook == null) {
            throw new CustomException("用户地址信息有误，不能下单");
        }

        //生成一个随机长整型作为订单号
        long orderId = IdWorker.getId();

        //使用该对象用来计算订单总金额; 原子操作，保证在多线程下计算无误
        AtomicInteger amount = new AtomicInteger(0);

        //遍历购物车数据集合，将每一条数据设置到订单明细表中， 并计算总金额
        List<OrderDetail> orderDetails = shoppingCarts.stream().map((item) -> {
            OrderDetail orderDetail = new OrderDetail();
            orderDetail.setOrderId(orderId);//订单id，为本次生成的订单号
            orderDetail.setNumber(item.getNumber());
            orderDetail.setDishFlavor(item.getDishFlavor());
            orderDetail.setDishId(item.getDishId());
            orderDetail.setSetmealId(item.getSetmealId());
            orderDetail.setName(item.getName());
            orderDetail.setImage(item.getImage());
            orderDetail.setAmount(item.getAmount());
            //计算订单总金额; 每遍历一条购物车数据就用金额乘以数量，并累加到amount中
            amount.addAndGet(item.getAmount().multiply(new BigDecimal(item.getNumber())).intValue());
            return orderDetail;
        }).collect(Collectors.toList());


        //设置属性到订单实体中
        orders.setId(orderId);//将生成的订单号作为该订单的id
        orders.setOrderTime(LocalDateTime.now());
        orders.setCheckoutTime(LocalDateTime.now());
        orders.setStatus(2);
        orders.setAmount(new BigDecimal(amount.get()));//订单总金额
        orders.setUserId(userId);
        orders.setNumber(String.valueOf(orderId));
        orders.setUserName(user.getName());
        orders.setConsignee(addressBook.getConsignee());
        orders.setPhone(addressBook.getPhone());
        orders.setAddress((addressBook.getProvinceName() == null ? "" : addressBook.getProvinceName())
                + (addressBook.getCityName() == null ? "" : addressBook.getCityName())
                + (addressBook.getDistrictName() == null ? "" : addressBook.getDistrictName())
                + (addressBook.getDetail() == null ? "" : addressBook.getDetail()));

        //向订单表插入数据，一条数据（每次下单对应一条订单数据）
        this.save(orders);

        //向订单明细表插入数据，多条数据 （一个订单中的下单的菜品及套餐数据）
        orderDetailService.saveBatch(orderDetails);

        //清空当前用户的购物车数据
        shoppingCartService.remove(wrapper);

    }
}